Abstract:This study investigates the damage, microstructure, and mechanical evolution of service-exposed HP40NbTi radiant tubes of a steam reformer furnace. Tube failure was reported after 6-year of working at 525°C-830°C in the form of visible longitudinal and transverse cracks. The microstructure was evaluated using optical and scanning electron microscopy equipped with energydispersive X-ray spectrum analysis. The carbide phase transformation was determined by the method based on the matrix dissolution technique and… Show more
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